Converting SMS number to double (VB.NET)

Question

I am trying to convert an SMS to double. I'm creating a monitoring system where values like "45.2" are sent to another modem.

I would like to convert 45.2 (which I think is string initially and placed in a textbox) to double so I can do comparison upon receiving it.

I have tried this but got errors:

Dim strMeasurement As String = txtMessage.Text.Trim
Dim dblMeasurement As Double = CDbl(strMeasurement)

Thanks.

Answer 1

请改用Double.TryParse（）

Answer 2

as rahul said:
use

Double.tryParse(stringvalue, doublevalueTofill)  

it returns a true if successful otherwise false.